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Finding the Fourth Proportional to 1,288.47, 1,932.71 and 314.57

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Solution

The fourth proportional to 1,288.47, 1,932.71 and 314.57 is: 471.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.47 : 1,932.71 = 314.57 : x
  2. Step 2: Convert to fraction form
    1,288.47/1,932.71 = 314.57/x
  3. Step 3: Cross multiply
    1,288.47x = 1,932.71 × 314.57
  4. Step 4: Simplify right side
    1,288.47x = 607,972.58
  5. Step 5: Solve for x
    x = 607,972.58/1,288.47
  6. Step 6: Final answer
    x = 471.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.